Why We Sleep

▶ Sleep is not a waste of time, although it takes about one third of our lives. ▶ While we sleep, the brain sorts the things we learned during the day. ▶ Memories move from short-term storage into long-term storage. ▶ That is why a good night of sleep before a test often helps more than studying until midnight. ▶ Sleep also repairs the body and keeps our feelings in balance. ▶ So going to bed on time is not lazy. ▶ It is one of the smartest study habits a student can have.